You sound like you might be repulsed. It’s possible to experience sex repulsion for a person of any sexual orientation. If you experience sexual attraction, you are probably not asexual, though you might be gray-A or demi, depending on how the sexual attraction occurs.
A demisexual person does have circumstances under which they do experience sexual attraction. A person who doesn’t experience sexual attraction, regardless of how much they enjoy sex, is still asexual. The creator of this blog (me) is an asexual person who enjoys several kinds of sexual activity. Sex repulsion is not inherent to asexuality, and a person who experiences any frequency of sexual attraction can be sex-repulsed.